Folding bag and method of folding folding bag

Abstract

A folding bag which can make the variations of a bag main body multifunctional to make it possible to improve the versatility is provided. A first piece of base fabric and a second piece of base fabric which are foldable and have engagement surfaces which can be engaged with each other such that male-female properties are changed on a front surface side and a rear surface side, and the first piece of base fabric and a second piece of base fabric have the same halved shapes including a center with respect to a predetermined developed shape, joint sides jointed to each other such that a foldable integrated sheet-like object exhibiting a predetermined developed shape in a state in which the engagement surface on the front surface side and the engagement surface on the rear surface side are alternated.

1 . A folding bag comprising:
 a first piece of base fabric and a second piece of base fabric which are foldable and have engagement surfaces which can be engaged with each other such that male-female properties are changed on a front surface side and a rear surface side, wherein   the first piece of base fabric and a second piece of base fabric have the same halved shapes including a center with respect to a predetermined developed shape,   joint sides jointed to each other such that a foldable integrated sheet-like object exhibiting a predetermined developed shape in a state in which the engagement surface on the front surface side and the engagement surface on the rear surface side are alternated, and   at least one pair of holes facing each other through the center when the joint sides are jointed to each other to form the integrated sheet-like object exhibiting the predetermined developed shape, and,   when the integrated sheet-like object exhibiting the predetermined developed shape is folded, the engagement surface on the front surface side and the engagement surface on the rear surface side of the first piece of base fabric or the second piece of base fabric are engaged with each other to form a bag main body having a predetermined three-dimensional shape.   
     
     
         2 . The folding bag according to  claim 1 , wherein
 when the integrated sheet-like object having the predetermined developed shape is folded to configure the predetermined three-dimensional bag main body, the holes serve as gripping parts.   
     
     
         3 . The folding bag according to  claim 1 , wherein
 the first piece of base fabric and the second piece of base fabric   exhibits an isosceles triangle and configure an integrated sheet-like object formed such that a predetermined developed shape obtained when long sides between the equal sides are jointed to each other as the joint sides is square, and   the holes are formed in, of the four corner parts obtained when the predetermined developed shape is square, corner parts facing each other through a center not crossing the first piece of base fabric and the second piece of base fabric.   
     
     
         4 . The folding bag according to  claim 1 , wherein
 the first piece of base fabric and the second piece of base fabric   exhibit isosceles triangles and configure an integrated sheet-like object formed such that a predetermined developed shape obtained when long sides between the equal sides are jointed to each other as the joint sides is square, and   the holes are formed in, of the four corner parts obtained when the predetermined developed shape is square, corner parts facing each other through a center crossing the first piece of base fabric and the second piece of base fabric.   
     
     
         5 . The folding bag according to  claim 1 , wherein
 the first piece of base fabric and the second piece of base fabric exhibit isosceles triangles and configure an integrated sheet-like object formed such that a predetermined developed shape obtained when long sides between the equal sides are jointed to each other as the joint sides is square, and the holes are formed in the four corner parts when the predetermined developed shape is square.   
     
     
         6 . A method of folding a folding bag using the integrated sheet-like object described in  claim 3 , comprising the steps of:
 a first folding-back procedure, in a state in which a male-side engagement surface or a female-side engagement surface of the first piece of base fabric and a female-side engagement surface or a male-side engagement surface of the second piece of base fabric are set as one-surface sides, setting one of the corner parts of any one of the first piece of base fabric or the second piece of base fabric as an apex and folding back a left-side region or a right-side region in a width direction to observer's right on the one-surface side or observer's left on the one-surface side,   a second folding-back procedure folding back the right-side region or the left-side region in the width direction to the observer's left on the one-surface side or the observer's right on the one-surface side, and   a third folding-back procedure folding back the one-surface side of the second piece of base fabric and the first piece of base fabric using the joint side as a valley folding line such that the hole of the first piece of base fabric and the hole of the second piece of base fabric located at the corner parts not crossing the first piece of base fabric and the second piece of base fabric overlap each other.   
     
     
         7 . A method of folding a folding bag using the integrated sheet-like object described in  claim 3 , comprising the steps of:
 a first center-folding procedure matching any one of corner parts of the first piece of base fabric or the second piece of base fabric with the other corner part,   a second center-folding procedure folding back a bottom-side region facing the corner parts of the overlapping first and second pieces of base fabric while leaving an apex-side region including the corner parts,   a fourth folding-back procedure folding back the apex-side region in a strip-shaped body as a whole toward the bottom-side region, and   a connecting procedure overlapping both ends such that the entire strip-shaped body becomes strip-shaped.   
     
     
         8 . A method of folding a folding bag using the integrated sheet-like object described in  claim 4 , comprising the steps of:
 a third center-folding procedure, in a state in which a male-side engagement surface or a female-side engagement surface of the first piece of base fabric and a female-side engagement surface or a male-side engagement surface of the second piece of base fabric are set as one-surface sides, setting one corner part crossing the first piece of base fabric and the second piece of base fabric as an apex and folding back a lower half region including the other corner part and an upper half region including one corner part to observer's upper side or observer's lower side,   a fifth folding-back procedure folding back a left-side region or a right-side region in a width direction to a one-surface side or an other-surface side such that an oblique line of the second piece of base fabric or the first piece of base fabric is substantially horizontal and a left-side corner part or a right-side corner part is substantially matched with the oblique line of the first piece of base fabric or the second piece of base fabric, and   a sixth folding-back procedure folding back the right-side region or the left-side region in the width direction to a one-surface side or an other-surface side such that the oblique line of the first piece of base fabric or the second piece of base fabric is substantially horizontal and a right-side corner part or a left-side corner part is substantially matched with the oblique line of the second piece of base fabric or the first piece of base fabric.   
     
     
         9 . A method of folding a folding bag using the integrated sheet-like object described in  claim 5 , comprising the steps of:
 a first folding-back procedure, in a state in which a male-side engagement surface or a female-side engagement surface of the first piece of base fabric and a female-side engagement surface or a male-side engagement surface of the second piece of base fabric are set as one-surface sides, setting one of the corner parts of any one of the first piece of base fabric or the second piece of base fabric as an apex and folding back a left-side region or a right-side region in a width direction to observer's right on the one-surface side or observer's left on the one-surface side,   a second folding-back procedure folding back the right-side region or the left-side region in the width direction to the observer's left on the one-surface side or the observer's right on the one-surface side, and   a third folding-back procedure folding back the one-surface side of the second piece of base fabric and the first piece of base fabric using the joint side as a valley folding line such that the hole of the first piece of base fabric and the hole of the second piece of base fabric located at the corner parts not crossing the first piece of base fabric and the second piece of base fabric overlap each other.   
     
     
         10 . A method of folding a folding bag using the integrated sheet-like object described in  claim 4 , comprising the steps of:
 a first center-folding procedure matching any one of corner parts of the first piece of base fabric or the second piece of base fabric with the other corner part,   a second center-folding procedure folding back a bottom-side region facing the corner parts of the overlapping first and second pieces of base fabric while leaving an apex-side region including the corner parts,   a fourth folding-back procedure folding back the apex-side region in a strip-shaped body as a whole toward the bottom-side region, and   a connecting procedure overlapping both ends such that the entire strip-shaped body becomes strip-shaped.   
     
     
         11 . A method of folding a folding bag using the integrated sheet-like object described in  claim 5 , comprising the steps of:
 a first center-folding procedure matching any one of corner parts of the first piece of base fabric or the second piece of base fabric with the other corner part,   a second center-folding procedure folding back a bottom-side region facing the corner parts of the overlapping first and second pieces of base fabric while leaving an apex-side region including the corner parts,   a fourth folding-back procedure folding back the apex-side region in a strip-shaped body as a whole toward the bottom-side region, and   a connecting procedure overlapping both ends such that the entire strip-shaped body becomes strip-shaped.   
     
     
         12 . A method of folding a folding bag using the integrated sheet-like object described in  claim 5 , comprising the steps of:
 a third center-folding procedure, in a state in which a male-side engagement surface or a female-side engagement surface of the first piece of base fabric and a female-side engagement surface or a male-side engagement surface of the second piece of base fabric are set as one-surface sides, setting one corner part crossing the first piece of base fabric and the second piece of base fabric as an apex and folding back a lower half region including the other corner part and an upper half region including one corner part to observer's upper side or observer's lower side,   a fifth folding-back procedure folding back a left-side region or a right-side region in a width direction to a one-surface side or an other-surface side such that an oblique line of the second piece of base fabric or the first piece of base fabric is substantially horizontal and a left-side corner part or a right-side corner part is substantially matched with the oblique line of the first piece of base fabric or the second piece of base fabric, and   a sixth folding-back procedure folding back the right-side region or the left-side region in the width direction to a one-surface side or an other-surface side such that the oblique line of the first piece of base fabric or the second piece of base fabric is substantially horizontal and a right-side corner part or a left-side corner part is substantially matched with the oblique line of the second piece of base fabric or the first piece of base fabric.